lecture19nth - Air is about 21% oxygen (dry air is 21%)...

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Unformatted text preview: Air is about 21% oxygen (dry air is 21%) Each gas in a mixture exerts a partial pressure (add to get total pressure of gas). 160 mm Hg/760 mm Hg = 0.21 150 mm Hg/760 mm Hg = 0.20 Using gas laws to help us understand how lungs fill with air ideal gas law: PV = nRT (Appendix B in book p. B-3) Figure 17-6 SO PRESSURE DROPS! Examples of familiar objects that use an increase in volume to pull air in when partial vacuum (lower pressure) is generated: syringe bicycle pump Figure 17-9 and Google images How much air moves in and out of lungs (ventilation)? 6000 Volume in lungs (ml) 3000 First - breathe out as much as you can not zero! "Residual volume" 0 Time (similar to Fig. 17.8) Gas movements - convection vs. diffusion (review and new terms) • Gases move from areas of higher total pressure to lower total pressure (convection, or bulk flow) • Individual gas components have net movement from areas of higher partial pressure to areas of lower partial pressure (diffusion down chemical gradients – modification from simple Fick's Law learned earlier) Gases dissolve in liquids. Partial pressure of a gas in a liquid is defined as the partial pressure of that same gas in the gas phase at equilibrium. Figure 18-2 Oxygen is not very soluble in water. Carbon dioxide is 20 x more soluble in water. Figure 18-2 ...
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This note was uploaded on 12/01/2010 for the course BIO SCI Bio Sci E1 taught by Professor Catherineloudin during the Spring '10 term at UC Irvine.

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lecture19nth - Air is about 21% oxygen (dry air is 21%)...

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